The LM516x device is a 65-V, 2-A synchronous step-down converter with integrated high-side and low-side MOSFETs. The constant ON-time control scheme requires no loop compensation and supports high step-down ratios with fast transient response. An internal feedback amplifier maintains ±1% output voltage regulation over the entire operating temperature range. The ON-time varies inversely with input voltage resulting in nearly constant switching frequency. Peak and valley current limit circuits protect against overload conditions. The undervoltage lockout (EN/UVLO) circuit provides independently adjustable input undervoltage threshold and hysteresis. The LM5160 is programmed through the FPWM pin to operate in continuous conduction mode (CCM) from no load to full load or to automatically switch to discontinuous conduction mode (DCM) at light load for higher efficiency. Forced CCM operation supports multiple output and isolated Fly-Buck applications using a coupled inductor.
●The LM5160A shares the same features and pin configuration as the LM5160. An external bias supply can be connected to the VCC pin of the LM5160A in either Buck or Fly-Buck applications. This additional capability can improve efficiency at high input voltages.
● Wide 4.5-V to 65-V Input Voltage Range
● Integrated High-Side and Low-Side Switches
● No Schottky Diode Required
● 2-A Maximum Load Current
● Constant ON-Time Control
● No External Loop Compensation
● Fast Transient Response
● Selectable Forced CCM or DCM Operation
● CCM Option Supports Multi-Output Fly-Buck™
● Nearly Constant Switching Frequency
● Frequency Adjustable Up to 1 MHz
● Programmable Soft-Start Time
● Prebiased Start-Up
● Peak Current Limiting Protection
● Adjustable Input UVLO and Hysteresis
● ±1% Feedback Voltage Reference
● LM5160A Allows External VCC Bias
● Thermal Shutdown Protection
